Some C libraries

Which ones did you try?
CPython supports glibc on Linux, though we might merge PR for others if they aren't a big maintenance burden.

@CharlieZhao95, do you remember which C library this was?
We can't easily fix this without a reproducer.

@CharlieZhao95, do you remember which C library this was? We can't easily fix this without a reproducer.

Thanks for the reminder, I missed the last message :)

I was working on a new unix-like embedded OS that uses musllibc. Now I think this case is more related to OS, maybe DST information is missing on the OS caused this error. And this is stated in the doc, I'm not sure if we should fix it.

See also:

    case 'Z':
        if (tm->tm_isdst < 0) {
            *l = 0;
            return "";
        }
        fmt = __tm_to_tzname(tm);
        goto string;
...

A new OS! Exciting ❤️

But, on a new OS, you will generally need to skip a few tests, or patch things here and there.
If you really want to, send a PR and we could merge it. It shouldn't break supported platforms, shouldn't make the test ineffective, and should be very simple. Ideally it would help other OSes as well.

I'll close the issue—remove it from CPython's TODO list. We can reopen if you send a PR.